Howey P W, Board R G, Kear J
Biotelemetry. 1977;4(4):169-80.
A multichannel biotelemetry system using pulse position modulation has been developed to monitor continuously the environment in birds' nests. Probes to measure temperature at six points, relative humidity, light and egg attitude, together with a transmitter and power supply are contained in a fibreglass shell, having the shape, size and weight of the egg of the species being studied. The sensing egg is placed in the nest at the completion of a clutch and not removed until the young have hatched. A low-power transponder is used to relay the signals up to 2 miles to a data-logging system in the laboratoy.
一种采用脉冲位置调制的多通道生物遥测系统已被开发出来，用于持续监测鸟巢内的环境。一个玻璃纤维外壳内包含用于测量六个点温度、相对湿度、光照和蛋的姿态的探头，以及一个发射器和电源，其形状、大小和重量与所研究物种的蛋相同。传感蛋在一窝蛋产完后被放置在巢中，直到幼鸟孵化出来才被取出。一个低功率转发器用于将信号中继至多2英里外实验室的数据记录系统。
